feat: Unfinaled extensions

src/main/java/studio/o7/remora/extensions/FrameworkExtension.java

@@ -7,9 +7,9 @@
 @Data
 public class FrameworkExtension {
     @Optional
-    private final Lombok lombok = new Lombok();
+    private Lombok lombok = new Lombok();
     @Optional
-    private final FastUtils fastUtils = new FastUtils();
+    private FastUtils fastUtils = new FastUtils();
 
     @Data
     public static class Lombok {

src/main/java/studio/o7/remora/extensions/RemoraExtension.java

@@ -26,10 +26,10 @@ public class RemoraExtension {
     /**
      * Configuration of included frameworks.
      */
-    private final FrameworkExtension framework = new FrameworkExtension();
+    private FrameworkExtension framework = new FrameworkExtension();
 
     /**
      * Configuration of publishing strategies.
      */
-    private final PublishingExtension publishing = new PublishingExtension();
+    private PublishingExtension publishing = new PublishingExtension();
 }